People’s tendency to perceive a thing a certain way because their previous experiences or expectations influence them is called

perceptual expectancy also called perceptual set

Explanation:

Perception is a tendency to see things in predisposed manners, as we already have experience or previous knowledge with things that will turn into perceving some things while ignoring others:

We become sensitive , since perception is an active process, we then form ourselves a bias or a readiness to see particular characteristics of a given stimulus-

This is why we can see many sides in a given issue depending from which background we stand and thus reality interpretation will have a bias.